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Ultima® MOS-5 Hydrogen Sulfide Intelligent Sensor

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Ultima MOS-5 Hydrogen Sulfide Intelligent Sensor Introduction to a HART Enabled Detector for Hydrogen Sulfide Gas Detection EVERY LIFE HAS A PURPOSE – PowerPoint PPT presentation

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Title: Ultima® MOS-5 Hydrogen Sulfide Intelligent Sensor


1
Ultima MOS-5 Hydrogen Sulfide Intelligent Sensor
Introduction to a HART Enabled Detector for
Hydrogen Sulfide Gas Detection
EVERY LIFE HAS A PURPOSE
2
Contents
  • Product Overview
  • Detector Placement
  • Wiring
  • Gas Check
  • Calibration
  • Fault Conditions
  • HART
  • Applications
  • Conclusion
  • Appendix

3
Ultima MOS-5 Intelligent Sensor
  • Description
  • Intelligent hydrogen sulfide (H2S) sensor that
    supports HART communication
  • Like other HART equipment, uses existing 4-20 mA
    wiring and reduces installation costs
  • Customer Benefits
  • Better diagnostics
  • Improved management of maintenance history and
    event log
  • ModBus data block transfer

4
New Features
  • HART
  • Two-way digital communication using existing
    wiring
  • Event logging
  • Store up to ten events each of warning and alarm
    events, calibrations and cal checks, and faults
  • Dual simultaneous block transfer ModBus
  • Receive up to 100 values with one request
  • Other features
  • Better protection against wiring misuse
  • New microprocessor and components

5
Ultima MOS-5 Intelligent Sensor at a Glance
The 4-20 mA output has a higher safety rating
than relay outputs.
6
Sensor Placement
  • Location and quantity of Ultima MOS-5 Sensors
    depend on several factors1, 2
  • Potential for personnel exposure
  • Density of hydrogen sulfide
  • Air velocity and direction of gas dispersion
  • Location and nature of potential leak sources
    (eg. pressure, amount, source temperature,
    distance)
  • Accessibility to the detection instruments
  • Ambient temperature and vibration
  • Affect of structural arrangements (eg. walls,
    troughs, partitions) on gas accumulations
  • Mechanical damage and contamination
  • Possible sources of electromagnetic or radio
    interference

1 ISA-RP92.0.02, Part II-1998, Installation,
Operation, and Maintenance of Toxic Gas-Detection
Instruments Hydrogen Sulfide, April 15,
1998. 2 Environmental, Health, and Safety
Guidelines for Offshore Oil and Gas Development,
International Finance Corporation, April 30, 2007.
7
Sensor Placement (Continued)
  • Industry organizations like the American
    Petroleum Institute recommend specific sensor
    locations, alarm settings, and maintenance
    cycles1

1 API RP 49, Recommended Practice for Drilling
and Well Servicing Operations Involving Hydrogen
Sulfide, 3rd Edition, May 2001, reaffirmed March
2007.
8
Gas Check
  • The Ultima MOS-5 gas check procedure
  • To enter gas check mode, do one of the following
  • Place magnet over MSA logo and hold until
    flashing - - appears on display
  • Send HART command or ModBus register
  • Apply hydrogen sulfide
  • When reading has stabilized, remove gas and the
    unit will return to normal operation

9
Calibration
  • The Ultima MOS-5 calibration is performed as
    follows
  • To enter calibration mode, do one of the
    following
  • Place magnet over MSA logo and hold until AC
    appears on display
  • Send HART command or ModBus register
  • Select calibration life
  • Apply calibration gas display changes from AC
    to CP
  • After few minutes, display changes from CP to
    CC
  • When gas is removed, reading returns to 0



10
Fault Conditions
  • The Ultima MOS-5 Intelligent Sensor has
    self-diagnostics that inform users when certain
    types of device failures have occurred
  • If a fault is detected, the output signal
    decreases, the fault relay de-energizes, and one
    of the following fault codes is displayed

11
HART
  • An expanded scale HART configuration offers a
    minimum current of 1.25 mA to match current
    settings for many controllers and PLCs

12
Uses of HART and ModBus
  • Asset management and process improvement
  • Check compliance to calibration schedule
  • Coordinate calibrations so as to reduce labor
    cost
  • Aggregate calibration to a control room
    anywhere in the world
  • Track gas concentration remotely
  • Read fault conditions from control room before
    sending technician to the field
  • Obtain readout of voltage at end of wire
  • Installation
  • Set up Ultima MOS-5 Intelligent Sensor easily
    without magnet

13
Applications
  • The Ultima MOS-5 Intelligent Sensor is well
    suited for monitoring the extraction, transport,
    storage, and processing of sour oil and natural
    gas
  • Common applications
  • Gas compressor stations
  • Pipelines
  • Gas turbine power plants
  • Oil and gas terminals
  • Refineries
  • Oil and gas storage tanks
  • Oil and gas platforms

14
Conclusion
  • The Ultima MOS-5 is a new hydrogen sulfide gas
    detector that improves plant safety
  • Reduces maintenance costs
  • Enhances management of maintenance history and
    fault records through HART and ModBus
  • When used with ModBus, block transfer enables
    fast delivery of large quantities of data
  • Allocation and placement of the detector follows
    common industry practice
  • Potential for personnel exposure, location and
    nature of the gas leak, and direction of gas
    dispersal are a few of several important
    considerations

15
Conclusion (Continued)
  • HART and ModBus communications allow users to get
    the full benefit from the Ultima MOS-5
    Intelligent Sensor
  • Real time device diagnostics enable proactive
    action to avoid process disruptions and unplanned
    shutdowns
  • The Ultima MOS-5 is a versatile detector, with
    broad application to the oil and gas, chemical
    process, and other industries

16
Appendix
17
Cross Sensitivity1
1 Icare model DMITT63. 2 Detcon model TP-524.
18
Cross Sensitivity (Continued)
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